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PHP Extension Examples

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(PHP Extension) Get ECC Public Key in JWK Format (JSON Web Key)

Demonstrates how to get an ECC public key in JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

Chilkat PHP Downloads

PHP Extension for Windows, Linux, MAC OS X,
Alpine Linux, Solaris, OpenBSD, FreeBSD,
and Linux armhf/aarch64

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

//  Note: This example requires Chilkat v9.5.0.66 or later.

//  Load a PEM file into memory.
$sbPem = new CkStringBuilder();
$success = $sbPem->LoadFile('qa_data/pem/ecc_public.pem','utf-8');
if ($success != true) {
    print 'Failed to load PEM file.' . "\n";
    exit;
}

//  Load the PEM into a public key object.
$pubKey = new CkPublicKey();
$success = $pubKey->LoadFromString($sbPem->getAsString());
if ($success != true) {
    print $pubKey->lastErrorText() . "\n";
    exit;
}

//  Get the public key in JWK format:
$jwk = $pubKey->getJwk();

//  The GetJwk method will return the JWK in the most compact JSON format possible,
//  as a single line with no extra whitespace.  To get a more human-readable JWK (for this example),
//  load into a Chilkat JSON object and emit non-compact:

$json = new CkJsonObject();
$json->Load($jwk);
$json->put_EmitCompact(false);
print 'ECC Public Key in JWK format:' . "\n";
print $json->emit() . "\n";

//  Sample output:
//  {
//    "kty": "EC",
//    "crv": "P-256",
//    "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
//    "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU"
//  }
// 
//  Additional information can be added like this:
$json->AppendString('use','enc');
$json->AppendString('kid','123ABC');

//  Now examine the JSON:
print $json->emit() . "\n";

//  {
//    "kty": "EC",
//    "crv": "P-256",
//    "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
//    "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
//    "use": "enc",
//    "kid": "123ABC"
//  }

?>

 

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